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i thought that turbos and superchargers cant be used together coz of the compression ratio..

and if there isnt a supercharger kit, how would it be on there with the turbo?

so the only route to gain big power is turbo, with a swap first..

or are the new 2.5i able to hold boost?

Oh yes they can.
THere is a kit somewhere for the sti. It uses the supercharger to get good low end, then a big turbo take over from there. It uses the same thought as a sequental twin turbo, which uses a small turbo that spools quickly and a larger turbo to create large boost at the high end.

just to correct you, the STI runs something around 8:1... 8:2 would be the same thing as 4:1, which is ridiculously low and the air fuel mixture would have a hard time making any power at that pressure.

and basically you'll have to do internals to run any more than 5psi reliably, and even at 5psi if anything goes wrong you'll have bad consequences.

the crank and crank cradle are weak on our blocks. the redesigned heads might be better or worse, no one really knows because no one's done it on an 06 SOHC yet.

it's just not a good idea, when you can easily cheaply and reliably do a swap and make more power with a turbo engine.

just to correct you, the STI runs something around 8:1... 8:2 would be the same thing as 4:1, which is ridiculously low and the air fuel mixture would have a hard time making any power at that pressure.

8.2 compression ratio does not reduce down or simplify into 4:1.
That's what a compression ratio is, compressing 8.2 parts of a said volume down to 1 at top-dead-center.

I am still wondering what happened to Hamfist's supercharger set-up, it looked very nice and sounded very close to being a "kit".

There might never be an end to this "project", but there is a guy working on a SC kit for the 2.5NA. But.. he's been working on it for a hellofa long time. I'm wondering if it's ever gonna finish. Or if it even really exists.

You can find an old Rimmer one, perhaps. I'll warn you about scams, however. I was considering one from a guy in Venezuela. I offered to meet him in Aruba and all of a sudden he can't get the time off or something like that.

MadMax in Connecticut has a supercharged RS. Check the NESIC forums for him to ask about it.

There might never be an end to this "project", but there is a guy working on a SC kit for the 2.5NA. But.. he's been working on it for a hellofa long time. I'm wondering if it's ever gonna finish. Or if it even really exists.

That's Gary, who goes by Hamfist here, and that kit will eventually come to market. He's working with Rimmer on it. I have one of Rimmer's old kits, that will be in my car "shortly". Anyways, head over to the correct forum and you can easily find both Reddevil's thread and Hamfist's thread on their respective projects...

Whaddya mean "correct forum", Matt? Are you trying to say that there's an Aftermarket Forced Induction forum in which people could raise questions about adding an aftermarket supercharger (which is, of course, a form of forced induction) to their N/A cars? I call bull****!

Whaddya mean "correct forum", Matt? Are you trying to say that there's an Aftermarket Forced Induction forum in which people could raise questions about adding an aftermarket supercharger (which is, of course, a form of forced induction) to their N/A cars? I call bull****!

To continue the wandering topic path, isnt VW using a twin charging setup in one of there cars. The twin charger setup looks like http://www.forcedairtech.com/ . Its like $10,000 for their stage 5 kit.

If you wanted a forced induction Subaru you should have bought a WRX. Honestly; you have the heaviest, least horsepower Impreza Subaru makes right now. Also the ugliest. I can't stand the 2006 alfa romeo / kia nose, but that's just my personal opinion. If you bought a year or two older car, you could have bought the WRX.

I'm not saying this to flame you. My point is this: You will not boost your car for less money than it would have cost to buy a WRX. It just won't happen. And when you throw labor and tuning in there, then it really won't happen. Then you look at the reliability you'll get out of boosting an engine designed to be N/A and you'll see why so few people are doing it.
The only exception, in my opinion, is boosting older body style cars. But there again it turns out to be cheaper to swap in a turbo engine than to boost the N/A engine. I have an engine swap and it is definitely fast, but it cost me more than a 2002 WRX would have cost and it has all the issues of an older car. Actually it is a lot faster than an STI even. But it doesn't have an STI 6 speed, STI brakes, STI interior, etc etc... And if it did... It would probably have cost as much as an STI.

Their actually is a supercharger kit. It's made in australia, and it cost a little over 4k. But it only pushs 7-9 pounds. I can't remember were I found it but I was searching yahoo almost a year ago when i found it. Was looking for them, for a subaru outback.